Udaka oluzilinganisayo lungathembela esisindweni salo ukuze lwakhe isisekelo esiyisicaba, esibushelelezi nesiqinile phezu kwesisekelo sokufaka noma ukubopha ezinye izinto. Ngesikhathi esifanayo, lungenza ukwakhiwa okukhulu nokusebenza kahle. Ngakho-ke, ukugeleza okuphezulu kuyisici esibaluleke kakhulu sodaka oluzilinganisayo. Ngaphezu kwalokho, kumele lube nokugcinwa kwamanzi kanye namandla okubopha, kungabi nalutho lokuhlukaniswa kwamanzi, futhi lube nezici zokuvimbela ukushisa kanye nokwenyuka kwezinga lokushisa eliphansi.
Ngokuvamile, udaka oluzilinganisa ludinga ukugeleza okuhle, kodwa ukugeleza kwe-paste yangempela yesamente kuvame ukuba yi-10-12cm kuphela; phakathiama-ether e-cellulose, i-hydroxypropyl methylcellulose (HPMC) iyisengezo esiyinhloko se-mortar exutshwe ngomumo, yize inani lokwengeza liphansi kakhulu, lingathuthukisa kakhulu ukusebenza kwe-mortar, lingathuthukisa ukuhambisana, ukusebenza komsebenzi, ukusebenza kokubopha kanye nokusebenza kokugcinwa kwamanzi kwe-mortar. Idlala indima ebaluleke kakhulu emkhakheni we-mortar exutshwe ngomumo.
1. Ukuhamba
I-Hydroxypropyl methylcellulose (HPMC)inethonya elibalulekile ekugcinweni kwamanzi, ukuhambisana kanye nokusebenza kokwakhiwa kwe-mortar yokuzilinganisa. Ikakhulukazi njenge-mortar yokuzilinganisa, ukugeleza kungenye yezinkomba eziyinhloko zokuhlola ukusebenza kwe-mortar yokuzilinganisa. Ngaphansi kwesisekelo sokuqinisekisa ukwakheka okuvamile kwe-mortar, ukugeleza kwe-mortar kungalungiswa ngokushintsha inani le-HPMC. Kodwa-ke, uma umthamo uphakeme kakhulu, ukugeleza kwe-mortar kuzoncishiswa, ngakho umthamo we-HPMC kufanele ulawulwe ngaphakathi kwebanga elifanele.
2. Ukugcinwa kwamanzi
Ukugcinwa kwamanzi kwesimende kuyinkomba ebalulekile yokukala ukuzinza kwezingxenye zangaphakathi zesimende esisanda kuhlanganiswa. Ukuze kwenziwe ngokugcwele ukusabela kokumanzi kwezinto zejeli, inani elifanele le-HPMC lingagcina umswakama esimendeni isikhathi eside. Ngokuvamile, izinga lokugcina amanzi kwesimende liyanda ngokwanda kokuqukethwe kwe-HPMC. Umsebenzi wokugcina amanzi we-HPMC ungavimbela isisekelo ukuthi singamunci amanzi amaningi ngokushesha, futhi uvimbele ukuhwamuka kwamanzi, ukuze kuqinisekiswe ukuthi indawo yesimende inikeza amanzi anele okumanzisa usimende. Ngaphezu kwalokho, ukumanzisa kwe-hydroxypropyl methylcellulose nakho kunethonya elikhulu ekugcinweni kwamanzi kwesimende. Uma ukumanzisa kuphakeme, kulapho ukugcinwa kwamanzi kuba ngcono khona. Ngokuvamile, imikhiqizo ene-viscosity engaba ngu-400mpa.s isetshenziswa kakhulu kwisimende esizilinganisayo, okungathuthukisa ukusebenza kokumanzisa kwesimende futhi kwandise ukuqina kwesimende.
3. Isikhathi sokusetha
I-HPMC inomphumela othile wokulibazisa ku-mortar. Ngokwanda komthamo, isikhathi sokubeka u-mortar siyanwetshwa. Umphumela wokulibazisa we-HPMC ku-cement paste uncike kakhulu ezingeni lokushintshana kwamaqembu e-alkyl, futhi awunabo ubudlelwano obuncane nesisindo sayo sama-molecule. Uma izinga lokushintshana kwe-alkyl lincane, okuqukethwe kwe-hydroxyl kukhulu, futhi umphumela wokulibazisa usobala kakhulu. Futhi lapho okuqukethwe kwe-HPMC kuphakeme, kulapho umphumela wesendlalelo sefilimu esiyinkimbinkimbi ubonakala khona ekulibazisekeni kokuqala komswakama we-cement, ngakho-ke umphumela wokulibazisa nawo usobala kakhulu.
4. Amandla okugobeka kanye namandla okucindezela
Ngokuvamile, amandla angenye yezinkomba ezibalulekile zokuhlola umphumela wokupholisa wezinto ezisekelwe kusimende engxubeni. Amandla okucindezela kanye namandla okuguquguquka kwesimende kuzoncipha ngokwanda kokuqukethwe kwe-HPMC.
5. Amandla esibopho
I-HPMC inethonya elikhulu ekusebenzeni kokubopha kwe-mortar.I-HPMCYakha ifilimu ye-polymer enomphumela wokuvala phakathi kwesistimu yesigaba soketshezi kanye nezinhlayiya ze-samente hydration, okukhuthaza amanzi amaningi kwifilimu ye-polymer ngaphandle kwezinhlayiya ze-samente, okusiza ekufakweni kwamanzi okuphelele kwe-samente, ngaleyo ndlela kuthuthukiswe ikhwalithi ye-slurry. Amandla e-bond aqinisiwe. Ngesikhathi esifanayo, ukwengeza inani elifanele le-HPMC kuthuthukisa i-plasticity kanye nokuguquguquka kwe-mortar, kunciphisa ukuqina kwendawo yokuguquka phakathi kwe-mortar kanye ne-substrate interface, futhi kunciphisa ikhono lokushelela phakathi kwe-interfaces. Ngezinga elithile, umphumela wokubopha phakathi kwe-mortar kanye ne-substrate uyathuthukiswa. Ngaphezu kwalokho, ngenxa yokuba khona kwe-HPMC ku-cement paste, kwakhiwa indawo ekhethekile yokuguquka kwe-interface kanye nesendlalelo se-interface phakathi kwezinhlayiya ze-mortar kanye nomkhiqizo we-hydration. Le sendlalelo se-interface senza indawo yokuguquka kwe-interface ibe lula futhi ingaqini. Ngakho-ke, i-Mortar inamandla aqinile okubopha.
Isikhathi sokuthunyelwe: Ephreli-25-2024